/plum"it/ , n.
1. Also called plumb bob . a piece of lead or some other weight attached to a line, used for determining perpendicularity, for sounding, etc.; the bob of a plumb line.
2. something that weighs down or depresses.
v.i.
3. to plunge.
[ 1350-1400; (n.) ME plommet plomb lead; (v.) deriv. of the n. See PLUMB, -ET ]
Syn. 3. fall, dive, drop, swoop.